Numerical Assessment of the Contribution of Liquefaction and Directivity on the Seismic Displacement of a Quay Wall during the 2014 Cephalonia, Greece, Earthquakes
Numerical Assessment of the Contribution of Liquefaction and Directivity on the Seismic Displacement of a Quay Wall during the 2014 Cephalonia, Greece, Earthquakes
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2014 年希腊凯法利尼亚岛地震期间液化和方向性对码头墙地震位移贡献的数值评估
DOI：
10.1061/9780784484432.024
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Tsiapas, Yiannis
中科院分区：
文献类型：
--
作者：
Zalachoris, George;Zekkos, Dimitrios;Athanasopoulos-Zekkos, Adda;Gerolymos, Nikos;Tsiapas, Yiannis
在2014年希腊Cephalonia地震序列（Mw=6.1和Mw=6.0）中，Cephalonia Lixouri港口的码头墙侧向位移达1.5 m，而砾石港口填方的液化导致地面开裂和粗颗粒喷出物的表现。为了评价利苏里港码头墙体的抗震性能，采用有限差分法在观测到最大水平位移的位置进行了数值分析，并将结果与观测到的响应进行了比较。根据现场调查数据（动态贯入试验，DPT和多通道表面波分析，MASW），考虑了三种常用的本构模型（PM4SAND， UBCSAND和URS/ROTH），用于模拟可液化土方的行为。数值分析结果表明，堆填土液化对码头侧移变形有显著影响；当液化发生时，计算得到的水平位移仅为观测到的侧向扩展的30%左右。总体而言，使用PM4SAND和UBCSAND模型的最佳估计输入参数的数值分析明显低于观测到的响应，而计算的水平位移比使用URS/ROTH模型时观测到的水平位移小约25%。模型预测之间的差异可以部分归因于在使用URS/ROTH模型时，一旦触发液化，将残余剪切强度纳入其中。最后，数值分析结果表明，脉冲特性和输入运动的极化对观测响应的影响很大，表明正向方向性对观测响应也有重要影响。
During the Cephalonia, Greece, 2014 earthquake sequence (Mw=6.1 and Mw=6.0), the quay walls in the port of Lixouri, Cephalonia, displaced laterally up to 1.5 m, while liquefaction of the gravelly port earthfills resulted in the manifestation of ground cracking and coarse-grained ejecta. To evaluate the seismic performance of the Lixouri port quay walls, numerical analyses using the finite difference method were performed at the location where the largest horizontal displacements were observed and the results are compared to the observed response. Three commonly used constitutive models (PM4SAND, UBCSAND, and URS/ROTH), informed by data from site investigation efforts (Dynamic Penetration Test, DPT, and Multichannel Analysis of Surface Waves, MASW), were considered for the simulation of the behavior of the liquefiable earthfills. The results of the numerical analyses indicate that liquefaction of the earthfills significantly contributed to the total lateral deformations of the quay walls; without liquefaction, the computed horizontal displacements are only approximately 30% of the observed lateral spreading when liquefaction occurs. Overall, the numerical analyses using best-estimate input parameters for the PM4SAND and UBCSAND models significantly under-predict the observed response, while the computed horizontal displacements are approximately 25% smaller than observed when the URS/ROTH model is used. The difference between model predictions can be partially attributed to the incorporation of residual shear strength once liquefaction is triggered when using the URS/ROTH model. Finally, the results of the numerical analyses show the strong influence of the pulse-like characteristics as well as the polarization of the input motion, indicating that forward directivity also significantly contributed to the observed response.
2014 年希腊凯法利尼亚岛地震中港口横向扩展
影响因子：
4
作者：
Athanasopoulos, G.A.;Kechagias, G.C.;Zekkos, D.;Batilas, A.;Karatzia, X.;Lyrantzaki, F.;Platis, A.
通讯作者：
Platis, A.